Reactive plasma spraying of wear-resistant coatings

Journal Article · Sun Mar 01 00:00:00 EST 1992 · Journal of Thermal Spray Technology; (United States)

DOI:https://doi.org/10.1007/BF02657018· OSTI ID:7111204

Smith, R W; Mutasim, Z Z ^[1]

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1. Drexel University, Philadelphia, PA (United States)

A method for producing wear-resistant, carbide-reinforced coatings has been investigated. A conventional low-pressure plasma gun has been modified with a downstream reactor into which carbon-containing gases are mixed, heated, and disassociated. The disassociated gas ions - H* and C* - are subsequently brought into contact with heated, molten metal matrix powders. Experiments with NiCr/Ti blends and W powders have shown that uniformly dispersed carbides such as TiC, Cr(x)C(y), WC, and W2C were formed in situ on the metal precursor powders during deposition. The in situ formed particles, being formed directly from the matrices, show excellent matrix cohesion and lead to high and uniform deposit microhardnesses. The process is described, and several evaluations of materials, reactive gases, and spray conditions are reported. Microanalysis of the coatings are presented, microhardness values are reported, and XRD identifies the in situ formed phases. 14 refs.

• OSTI ID: 7111204
• Journal Information: Journal of Thermal Spray Technology; (United States), Vol. 1:1; ISSN 1059-9630
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM CARBIDES
MICROHARDNESS
MICROSTRUCTURE
PLASMA ARC SPRAYING
NICKEL CARBIDES
TITANIUM CARBIDES
TUNGSTEN CARBIDES
AEROSPACE INDUSTRY
CARBON IONS
DISSOCIATION
HYDROCARBONS
HYDROGEN IONS
LIQUID METALS
MICROANALYSIS
PHASE STUDIES
PROTECTIVE COATINGS
SERVICE LIFE
WEAR RESISTANCE
X-RAY DIFFRACTION
CARBIDES
CARBON COMPOUNDS
CHARGED PARTICLES
CHROMIUM COMPOUNDS
COATINGS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DEPOSITION
DIFFRACTION
ELEMENTS
FLUIDS
HARDNESS
INDUSTRY
IONS
LIFETIME
LIQUIDS
MECHANICAL PROPERTIES
METALS
NICKEL COMPOUNDS
ORGANIC COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
SPRAY COATING
SURFACE COATING
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties